A274021 - cp's OEIS frontend

A274021 Least positive x < n-1 such that x^y == -1 (mod n) for some y > 1, or 0 if no such x exist.

n	a(n)
1	0
2	0
3	0
4	0
5	2
6	0
7	3
8	0
9	2
10	3
11	2
12	0
13	2
14	3
15	0
16	0
17	2
18	5
19	2
20	0
21	5
22	7
23	5
24	0
25	2
26	5
27	2
28	3
29	2
30	0
31	3
32	0
33	2
34	3
35	19
36	11
37	2
38	3
39	17
40	0
41	2
42	5
43	2
44	7
45	14
46	5
47	5
48	0
49	3
50	3
51	0
52	23
53	2
54	5
55	19
56	31
57	2
58	3
59	2
60	0
61	2
62	3
63	5
64	0
65	2
66	17
67	2
68	0
69	5
70	19
71	7
72	23
73	3
74	3
75	14
76	3
77	6
78	17
79	3
80	0
81	2
82	3
83	2
84	47
85	13
86	3
87	5
88	7
89	3
90	29
91	10

[0, 0, 0, 0, 2, 0, 3, 0, 2, 3, 2, 0, 2, 3, 0, 0, 2, 5, 2, 0, 5, 7, 5, 0, 2, 5, 2, 3, 2, 0, 3, 0, 2, 3, 19, 11, 2, 3, 17, 0, 2, 5, 2, 7, 14, 5, 5, 0, 3, 3, 0, 23, 2, 5, 19, 31, 2, 3, 2, 0, 2, 3, 5, 0, 2, 17, 2, 0, 5, 19, 7, 23, 3, 3, 14, 3, 6, 17, 3, 0, 2, 3, 2, 47, 13, 3, 5, 7, 3, 29, 10]

cp's OEIS Frontend

A274021 Least positive x < n-1 such that x^y == -1 (mod n) for some y > 1, or 0 if no such x exist.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	0
5	2
6	0
7	3
8	0
9	2
10	3
11	2
12	0
13	2
14	3
15	0
16	0
17	2
18	5
19	2
20	0
21	5
22	7
23	5
24	0
25	2
26	5
27	2
28	3
29	2
30	0
31	3
32	0
33	2
34	3
35	19
36	11
37	2
38	3
39	17
40	0
41	2
42	5
43	2
44	7
45	14
46	5
47	5
48	0
49	3
50	3
51	0
52	23
53	2
54	5
55	19
56	31
57	2
58	3
59	2
60	0
61	2
62	3
63	5
64	0
65	2
66	17
67	2
68	0
69	5
70	19
71	7
72	23
73	3
74	3
75	14
76	3
77	6
78	17
79	3
80	0
81	2
82	3
83	2
84	47
85	13
86	3
87	5
88	7
89	3
90	29
91	10

n	a(n)
1	0
2	0
3	0
4	0
5	2
6	0
7	3
8	0
9	2
10	3
11	2
12	0
13	2
14	3
15	0
16	0
17	2
18	5
19	2
20	0
21	5
22	7
23	5
24	0
25	2
26	5
27	2
28	3
29	2
30	0
31	3
32	0
33	2
34	3
35	19
36	11
37	2
38	3
39	17
40	0
41	2
42	5
43	2
44	7
45	14
46	5
47	5
48	0
49	3
50	3
51	0
52	23
53	2
54	5
55	19
56	31
57	2
58	3
59	2
60	0
61	2
62	3
63	5
64	0
65	2
66	17
67	2
68	0
69	5
70	19
71	7
72	23
73	3
74	3
75	14
76	3
77	6
78	17
79	3
80	0
81	2
82	3
83	2
84	47
85	13
86	3
87	5
88	7
89	3
90	29
91	10

n	a(n)
1	0
2	0
3	0
4	0
5	2
6	0
7	3
8	0
9	2
10	3
11	2
12	0
13	2
14	3
15	0
16	0
17	2
18	5
19	2
20	0
21	5
22	7
23	5
24	0
25	2
26	5
27	2
28	3
29	2
30	0
31	3
32	0
33	2
34	3
35	19
36	11
37	2
38	3
39	17
40	0
41	2
42	5
43	2
44	7
45	14
46	5
47	5
48	0
49	3
50	3
51	0
52	23
53	2
54	5
55	19
56	31
57	2
58	3
59	2
60	0
61	2
62	3
63	5
64	0
65	2
66	17
67	2
68	0
69	5
70	19
71	7
72	23
73	3
74	3
75	14
76	3
77	6
78	17
79	3
80	0
81	2
82	3
83	2
84	47
85	13
86	3
87	5
88	7
89	3
90	29
91	10